Telephone system.



H. F. JOEGKEL.

TELEPHONE SYSTEM.

APPLIOATION FILED 413.18, 1911.

:DLUMBIA PLANDURAPH CO.. WASHlNu'roN. n. c.

Patented Oct 31; 1911.

HENRY F. JOEGKEL, 0F CAMP POINT, ILLINOIS.

TELEPHONE SYSTEM.

Specification of Letters Patent.

Application filed March 16, 1911.

Patented Oct. 31, 1911 Serial No. 614,964.

To all whom it may concern:

Be it known that I, HENRY F. J OECKEL, a citizen of the United States,residing at Camp Point, in the county of Adams and State of Illinois,having invented new and useful Improvements in Telephone Systems, ofwhich the following is a specification, and which are illustrated in theaccompanying drawing, forming a part thereof.

The invention relates to Patents No. 955,335 and No. 982,209. The sametelephone instruments are used but also wired to be used upon thistelephone system in which annunciators are connected to the ground fromeach side of the metallic line circuit.

The object is to provide a telephone system with a more balancedmetallic talking line circuit than that of Patent No. 955,335 and not soexpensive as that of Patent No. 982,209. These objects are obtained inthe mechanism and system of wiring, as hereinafter described and shownin the accompanying drawing.

The drawing represents central stations at 20 and 21 and at 22 and 23substations of a party line, the line wires are shown at L and L Whilebut two telephones are shown, it is to be understood that there "may bemore, and that there may be more. than two central stations, or less,also that all stations of a line may be central stations, and the lineused as a trunk or toll line.

The central station line jack 13 of station 20 is connected at the tipspring a to L and at the sleeve spring 7) to L, the annunciator 14 isconnected to ground fromL at line jack spring a. The line jack 13 ofcentral station 21 is connected at the tip spring a to L and wit-h thesleeve spring I) to L the annunciator 14 is connected to ground from Lat line jack spring 6.

The telephone instruments of substation 22 consisting of a magneto 1, anannunciator 2, switch E, transmitter 3, receiver 4, induction coil 5 andswitch hook 7 are the same shown in Patent No. 955,335, a switcharm Fand contacts 70 and Z have been added in the circuit of the magneto, acondenser D in the secondary talking circuit and a clip 6' in the twireh of the bell or annunciator circuit. In

cuit of these instruments have otherwise not been changed, and thereforemay, by connecting clip 6 to wire it at j be used as described in PatentNo. 955,335. The telephone of this station is connected to L by bindingpost A, to L by binding post G, and to the ground by binding post B. Thesecondary talking circuit is from L to L by binding post A, wire f,switch hook 7, wire 7, induction coil 5, wire 7, condenser D, receiverwire 7", and binding post C, the circuit is however normally interruptedat the switch hook. The annunciator circuit is from L to ground bybinding post A, wire 7, clip 6, wire f, and binding postB. The magnetocircuit is from L to ground by binding post A,-wire f cont-act 7c,switcharm F, magneto 1, wire it, switch E, wire f, and binding post B;from L to ground by binding post O, wire f contact Z, switcharm F,magneto 1, wire it, normal position of switch E, wire 1, and bindingpost B; and from L to L by binding post A, wire f, contactk, switcharmF, magneto 1, wire 72,, switch E, wire 7, and binding post C. Themagneto is however normally cut out at the usual cut out. The wire 72.of the annunciator 2 may be permanently connected to wire f instead ofto switch E and the normal position of the switch E and F may then bechanged without departing from the system.

The telephone instruments of substation 23 consisting of a magneto 1,annunciator 2, switch 12, transmitter 3, receiver 4, induction coil 5,and switch hook 7 are the same shown in Patent No. 982,209, a switcharmF and contacts is and Z have been added in the circuit of the magnetoand a condenser D in the secondary talking circuit, the switch 48recommended in the system of Patent No. 982,209 is not used in thissystem, the circuits of these instruments have otherwise not beenchanged and the telephone may still be used in said patented system. Thetelephone is connected to L by binding post 8, to L by binding posts 9and 11, and to the ground by binding post 10. The secondary talkingcircuit is from L to L by binding post 9, wire f, switch hook 7, wire finduction coil 5, wire f condenser D, receiver 4, wire f, and bindingpost 8. The annunciator circuit is from L to ground by binding post 11,wire f switcharm 8, wire it, annunciator 2, wire it, switcharm s, wiref, and binding post 10. The magneto circuit from L to ground is bybinding post 11,

wire f switcharm 8, wire f contact 70, switcharm F, magneto 1, wire it,switcharm 8, wire f, and binding post 10; from L to ground by bindingpost 8, wire contact Z, switcharni F, magneto 1, wire it, switcharm 8,wire f, and binding post 10; and from L to L by binding post 8, wire 7,switcharm 3, wire 7L, magneto 1, switcharm F, contact 7.2, wire fswitcharm a, wire 9, and binding post 9.

The telephone instruments of stations 22 and 23 and their wiring, exceptthe dividing of the talking and signaling circuits are those oftelephones of the usual bridging telephone system, in which the bellshave a resistance of from 1,000 to 2,500 ohms. Various ways are used bydifferent manufacturers to normally cut the magneto of their telephonesout of circuit, some alternately cut their bell or magneto out ofcircuit, any of those telephones may have their circuits divided inaccordance with this system without changing in that respect.

The balancing of the metallic talking line circuit is in giving eachside an equal amount of ground, for that purpose one bell and one dropare shown connected to ground from L, and the other bell. and dropconnected to ground from L this divides the ringing load of the line andgives each side of the metallic circuit nearly an equal amount ofground. Each telephone is provided with switching means to place themagneto in circuit to signal any station upon the line by a signalingcode and also to signal over a complete metallic circuit to operate aswitch board clearing out drop. The condenser D avoids ringing over bothsides of the metallic circuit when receivers are down. The connecting ofannunciators to ground from both sides of a metallic talking circuit asshown forms a shunt for the talking current, therefore high resistanceannunciator coils are preferable in this system.

The different parts used in the combination of this telephone system arewell known and need no detailed description.

hat I claim as my invention, and desire to secure by Letters Patent, is

1. The combination, in a telephone system, a central station, a metalliccircuit leading therefrom and being normally open at said station, aplurality of substation talking sets bridged into the circuit saidbridges being normally interrupted at the switch hook, each substationhaving an annunciator normally connected to ground from one or the otherside of the metallic circuit, a magneto in a normally open branch ateach substation, and switching means adapted to connect the magneto toground from either side of the metallic circuit or to bridge into themetallic circuit, and an annunciator connected to ground at the centralstation from one or the other side of the metallic circuit, saidannunciators being however connected to ground so as to give each sideof the metallic circuit nearly an equal amount of ground.

2. The combination, in a telephone system, a central station, a metalliccircuit leading therefrom, a plurality of substation talking setsbridged into the circuit said bridges being normally interrupted at theswitch hook, each substation having an annunciator normally connected tothe ground from one or the other side of the metallic circuit, a magnetoand switching means at each substation to connect the magneto to groundfrom either side of the metallic circuit or to bridge into the metalliccircuit or to leave out of either circuit, an annunciator at the centralstation connected to ground from one or the other side of the metalliccircuit, said annunciators being however connected to ground so as togive each side of the metallic circuit nearly an equal amount of ground.

3. The combination, in a telephone system, a central station, aplurality of substations, a metallic talking circuit connecting all ofsaid stations, an annunciator normally contained in a ground branch atthe central station, and a ground branch at each substation, containinga non-polarized annunciator, said ground branches of said substationsbeing divided equally upon both sides of the metallic talking circuit, amagneto at each substation, and switching means at each substation toconnect the magneto in circuit with the annunciators upon either side ofthe metallic circuit, to bridge the magneto into the metallic circuit,or to leave the magneto normally out of circuit.

l. The combination, in a telephone system, a central station, a metalliccircuit leading therefrom, a plurality of substation talking setsbridged into the circuit, said bridges being however normallyinterrupted at the switch hook, a normal ground branch containing anannunciator at each station, said ground branches being divided uponboth sides of the metallic circuit so as to balance the metalliccircuit, a magneto and means at each substation to connect the magnetoto ground from either side of the metallic circuit and to signal anystation upon their respective sides by a signaling code, or to bridgethe magneto into the metallic circuit, or to normally cut the magnetoout of circuit.

5. The combination, in a telephone system, a plurality of centralstations, a metallic cii cuit connecting said stations, normally open ateach station, a plurality of substation talking sets bridged into thecircuit, said bridges being however normally interrupted at the switchhook, a normally closed ground branch containing a non-polarizedannunciator at each station, said ground branches being divided upon thetwo sides of the metallic circuit to give each side nearly an equalamount of ground, a magneto and switching means at each substationadapted to place the magneto in circuit with the ground branches ofeither side of the metallic circuit to signal any station upon theirrespective sides by a signaling code, the magneto being however normallynot in circuit.

6. The combination, in a telephone, system, a plurality of centralstations, a metallic circuit connecting said stations, normally open ateach station, a ground branch containing an annunciator at each station,said ground branches being divided upon the two sides of the metalliccircuit to give each side nearly an equal amount of ground, saidannunciators of either side being adapted to be operated upon theirrespective sides collectively by a signaling code.

7. The combination, in a magneto, local battery, telephone set, asecondary talking circuit terminating at two binding posts A and C, anannunciator circuit terminating at binding posts A and B, a magneto andmeans to terminate the magneto circuit at binding posts A and B, C andB, or at A and O, substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

HENRY F. J OECKEL.

Witnesses:

N. R. BECKETT, HARVEY BLODT.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, I). G.

